Casting molded wind power retainer and bearing

Abstract

The invention discloses a casting-molded wind power retainer and a bearing, and belongs to the technical field of bearing retainers. The retainer is defined by at least two unit retainers. Each unit retainer comprises a first end plate, a second end plate and a third end plate, the first end plate and the second end plate are each of an annular plate-shaped structure, and the first end plate and the second end plate are concentrically arranged; one end of each spacing plate is connected with the first end plate, the other end of each spacing plate is connected with the second end plate, and a pocket is formed between every two adjacent spacing plates; the limiting units are connected with the spacing plate, one part of the limiting units extend by a preset distance in the direction of the circle center of the first end plate, and the other part of the limiting units extend by a preset distance in the direction away from the circle center of the first end plate; the first end plate, the second end plate, the spacing plate and the limiting unit are integrally formed through high-pressure casting. The technical problem that in a three-row rolling body slewing bearing structure, the motion amplitude of a vertical bearing unit holder is too large is solved.

Description

Technical Field

[0001] The invention relates to the technical field of bearing retainers, and in particular to a cast wind power retainer and a bearing. Background Art

[0002] Wind turbine main shaft bearings are key components in wind turbines. Their main function is to support the rotating part of the wind turbine and ensure the smooth rotation of the wind rotor, thereby effectively converting wind energy into electrical energy. Wind turbine main shaft bearings usually include two types: sliding bearings and rolling bearings. Sliding bearings support the main shaft through sliding friction, and have the advantages of simple structure and strong load-bearing capacity; while rolling bearings reduce friction through the rolling of rolling elements, and have the characteristics of smooth operation and low noise.

[0003] One type of rolling wind turbine main shaft bearing is a three-row rolling element slewing bearing structure, which includes two rows of horizontal support units, and one row of vertical support units between the two rows of horizontal support units. In current wind turbine bearings, during the rotation of the bearing, the retainer of the vertical support unit has a technical problem of excessive movement. Summary of the invention

[0004] The main purpose of the present invention is to provide a cast wind power retainer and bearing, aiming to solve the technical problem of excessive movement range of the retainer of the vertical support unit in the three-row rolling element slewing support structure.

[0005] To achieve the above-mentioned purpose, the cast wind turbine retainer proposed in the present invention is formed by enclosing at least two unit retainers, and the unit retainer includes: a first end plate; A second end plate, wherein both the first end plate and the second end plate are annular plate structures and are concentrically arranged; A spacer plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate, and a pocket is formed between two adjacent spacers; a limiting unit, wherein the limiting unit is connected to the spacer plate, a portion of the limiting unit extends a predetermined distance toward the center of the first end plate, and another portion of the limiting unit extends a predetermined distance away from the center of the first end plate; The first end plate, the second end plate, the spacer plate and the limiting unit are integrally formed by high-pressure casting.

[0006] Optionally, in an embodiment of the present invention, the first end plate, the second end plate, the spacer plate and the limiting unit are all made of iron.

[0007] Optionally, in an embodiment of the present invention, the first end plate, the second end plate, the spacer plate and the limiting unit are all made of copper.

[0008] Optionally, in an embodiment of the present invention, the rolling body is a cylindrical rolling body, and the cylindrical rolling body protrudes from the limiting unit.

[0009] Optionally, in an embodiment of the present invention, the limiting unit includes: A limiting rod, the limiting rod extending toward the center of the circle by a predetermined distance; A limit support, wherein the limit support extends away from the center of the circle by a predetermined distance, and the limit supports of two adjacent spacer plates support the rolling body.

[0010] Optionally, in an embodiment of the present invention, a semi-cylindrical abutment portion is provided at one end of the limiting rod facing the center of the circle.

[0011] Optionally, in one embodiment of the present invention, part of the spacer plates are connected to the limit rods, a plurality of the limit rods are evenly spaced, the spacer plates connected to the limit rods are defined as a limit partition, and two of the limit rods are connected to the limit partition.

[0012] Optionally, in an embodiment of the present invention, the partition plate connected to the limiting rod is defined as a limiting partition, and two limiting rods are connected to the limiting partition.

[0013] Optionally, in one embodiment of the present invention, each of the partition plates is connected to the limit supports, each of the partition plates is connected to two limit supports, the limit supports located at both ends of the first end plate are unidirectional supports, and the other limit supports are bidirectional supports.

[0014] Optionally, in one embodiment of the present invention, the spacer plate gradually expands along the direction from the first end plate to the second end plate.

[0015] To achieve the above object, the present invention further provides a bearing, comprising: an inner ring, an outer ring and the wind power retaining frame cast as described above.

[0016] Compared with the prior art, the present invention can at least achieve the following beneficial effects. Since the three-row rolling element slewing support structure has a high load-bearing capacity, it is often used in the main shaft of a wind power bearing. There is a vertical support unit in the three-row rolling element slewing support structure. During the rotation of the wind power bearing, since there is a gap between the vertical support unit and the inner ring and outer ring of the bearing, the retaining frame of the vertical support unit will move during the rotation process and come into contact with the inner ring or the outer ring. This phenomenon is difficult to completely avoid, but excessive contact of the retaining frame will increase the internal friction of the bearing, produce unnecessary wear, and even cause the bearing components to break or break, increasing the operation and maintenance cost of the wind power bearing. In addition, excessive movement of the retaining frame will gradually separate from the rolling element, reduce the restriction on the rolling element, and cause the rolling element to produce a large amplitude of vibration, affecting the stability of the bearing operation. To this end, a limit unit is set on the retaining frame, and the limit unit extends a predetermined distance to both sides of the first end plate, that is, after assembly, the limit unit extends a predetermined distance to the inner ring direction and the outer ring direction of the bearing. During the operation of the bearing, when the cage gradually moves toward the inner ring or outer ring, the limit unit contacts the inner ring or outer ring to prevent the cage from contacting the inner ring or outer ring over a large area and thus generating a large friction force. In addition, after the limit unit contacts the outer ring or inner ring, it can prevent the cage from excessively separating from the rolling element, which can better limit the movement trajectory of the rolling element and ensure the smooth transportation of the bearing. This solution solves the technical problem of excessive movement of the cage in the current wind power bearing by setting a limit unit.

[0017] In addition, the unit cage is integrally formed through a high-pressure casting process. During the high-pressure casting process, liquid metal is quickly injected into the mold cavity under high pressure. The high-pressure environment helps the molten metal to fill every corner of the mold more fully and quickly. The close arrangement of the molten metal makes the microstructure inside the casting more compact, reducing the formation of pores and defects, thereby improving the strength and hardness of the casting. In addition, compared with normal pressure casting, the cooling rate of the molten metal in high-pressure casting is faster. Rapid cooling helps the casting form a fine grain structure. The finer the grain structure, the more grain boundaries there are. The grain boundaries can effectively disperse and resist the stress generated by the outside world. Therefore, the cage formed by high-pressure casting has a higher structural strength, which can meet the working requirements of wind power bearings such as variable loads and repeated starts, and improves the durability of the cage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of a cast wind turbine retainer according to the present invention; Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 3 This is a rear view of a cast wind turbine retainer; Figure 4 This is a three-dimensional diagram of a cast wind turbine retaining frame according to the present invention.

[0020] Description of Figure Numbers: 100, first end plate; 200, second end plate; 300, spacer plate; 400, limit unit; 410, limit rod; 411, abutment portion; 420, limit support; The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0025] Reference Figure 1~Figure 4 The present invention provides a cast wind turbine retainer, which is formed by at least two unit retainers, and the unit retainer includes: A first end plate 100; The second end plate 200, the first end plate 100 and the second end plate 200 are both annular plate structures, and the two are arranged concentrically; A partition plate 300, one end of the partition plate 300 is connected to the first end plate 100, and the other end of the partition plate 300 is connected to the second end plate 200, and a pocket is formed between two adjacent partition plates 300; A limiting unit 400, the limiting unit 400 is connected to the spacer plate 300, a portion of the limiting unit 400 extends toward the center of the first end plate 100 by a predetermined distance, and another portion of the limiting unit 400 extends away from the center of the first end plate 100 by a predetermined distance; The first end plate 100 , the second end plate 200 , the spacer plate 300 and the limiting unit 400 are integrally formed by high-pressure casting.

[0026] Since the three-row rolling element slewing bearing structure has a high load-bearing capacity, it is often used in the main shaft of wind power bearings. There is a vertical support unit in the three-row rolling element slewing bearing structure. During the rotation of the wind power bearing, since there is a gap between the vertical support unit and the inner ring and outer ring of the bearing, the retainer of the vertical support unit will move during the rotation and come into contact with the inner ring or outer ring. This phenomenon is difficult to completely avoid, but excessive contact of the retainer will increase the internal friction of the bearing, produce unnecessary wear, and even cause the bearing components to break or break, increasing the operation and maintenance cost of the wind power bearing. In addition, excessive movement of the retainer will gradually separate from the rolling element, reduce the restriction on the rolling element, and cause the rolling element to vibrate more significantly, affecting the stability of the bearing operation. For this reason, a limit unit 400 is set on the retainer, and the limit unit 400 extends a predetermined distance to both sides of the first end plate 100, that is, after assembly, the limit unit 400 extends a predetermined distance to the inner ring direction and the outer ring direction of the bearing. During the operation of the bearing, when the retainer gradually moves toward the inner ring or outer ring, the limiting unit 400 contacts the inner ring or outer ring to prevent the retainer from contacting the inner ring or outer ring over a large area and thus generating a large friction force. In addition, after the limiting unit 400 contacts the outer ring or inner ring, it can prevent the retainer from excessively separating from the rolling element, which can better limit the movement trajectory of the rolling element and ensure the smooth transportation of the bearing. This solution solves the technical problem of excessive movement of the retainer in the current wind power bearing by setting the limiting unit 400.

[0027] In addition, the unit cage is integrally formed by a high-pressure casting process. During the high-pressure casting process, liquid metal is quickly injected into the mold cavity under high pressure. The high-pressure environment helps the molten metal to fill every corner of the mold more fully and quickly. The close arrangement of the molten metal makes the microstructure inside the casting more compact, reducing the formation of pores and defects, thereby improving the strength and hardness of the casting. In addition, compared with normal pressure casting, the cooling rate of the molten metal in high-pressure casting is faster, and rapid cooling helps the casting to form a fine grain structure. The finer the grain structure, the more grain boundaries there are. The grain boundaries can effectively disperse and resist the stress generated by the outside world. Therefore, the cage formed by high-pressure casting has a higher structural strength, which can meet the working requirements of wind power bearings such as variable loads and repeated starts, and improves the durability of the cage. In addition, before high-pressure casting, the casting mold needs to be preheated. After the casting mold is preheated to a predetermined stability, the casting liquid is injected into the mold under high pressure to prevent the high-temperature casting liquid from contacting the low-temperature mold and causing the casting liquid to solidify prematurely.

[0028] In traditional processing methods, multiple parts need to be assembled by welding or other means. During welding, defects such as welds, pores, and slag inclusions may occur, resulting in reduced strength and durability of the product. One-piece molding can avoid these problems. There are no gaps or weak points on the surface of the cage, which can prevent moisture, salt spray, etc. from entering the cage and causing corrosion inside.

[0029] Furthermore, the casting material of the cage is iron or copper. The iron cage has excellent strength and hardness, can withstand the huge stress generated by the wind turbine main shaft under high-speed rotation and complex load conditions, and can make the cage stable for long-term use. Preferably, ductile iron QT400-18 or QT500-18 can be selected.

[0030] Among them, the tensile strength of QT400-18 ductile cast iron is higher than 400MPa, the yield strength is higher than 220MPa, and the elongation after fracture is ≥12.5%. The above mechanical properties ensure the stability and reliability of wind turbine retaining frames under high loads and complex stress conditions.

[0031] Whether it is the mountain top area or the seaside area, the temperature is relatively low, especially at night. QT400-18 ductile iron has good low-temperature impact toughness and can maintain good mechanical properties in low-temperature environments. In addition, it also has good wear resistance and shock absorption, which reduces the wear and vibration of the cage during operation and prolongs its service life.

[0032] Compared with QT400-18 ductile iron, QT500-18 ductile iron has improved mechanical properties, low-temperature impact toughness, wear resistance and shock absorption. Therefore, different grades of ductile iron can be selected for cage casting according to different work requirements.

[0033] In addition, the material of the cage can also be copper. Copper has excellent corrosion resistance, especially in harsh environments such as moisture and salt spray, and can be used for a long time. Since wind turbines are often installed at the seaside or at sea, moisture resistance and salt spray resistance are crucial for the cage. In addition, due to the high load of wind turbine bearings, a large amount of heat will be generated during operation. Copper has excellent thermal conductivity and can quickly transfer the heat generated during the operation of the bearing, so that the bearing can operate within the normal temperature range. Copper also has sufficient strength and toughness to withstand the huge stress generated by wind turbine bearings under high-speed rotation and complex load conditions.

[0034] In order to further improve the weather resistance of the cage, an anti-corrosion layer may be coated on the surface of the cage. Specifically, the anti-corrosion coating may be epoxy anti-corrosion paint, polyurethane paint, etc.

[0035] Specifically, the limiting unit 400 includes a limiting rod 410 and a limiting support 420, wherein the limiting rod 410 is close to the inner ring of the bearing, and the limiting support 420 is close to the outer ring of the bearing. After the cage is assembled with the rolling element, the rolling element protrudes from the limiting unit 400 to abut against the inner ring and the outer ring for operation.

[0036] In the process of arranging the limiting rods 410 and the limiting supports 420, not every spacer plate 300 is connected to the limiting rod 410, and the spacer plate 300 connected to the limiting rod 410 is defined as a limiting partition. The limiting partition is spaced apart from the conventional spacer plates, and the number of the limiting rods 410 is reduced, so that the weight can be reduced while ensuring the limiting effect.

[0037] Furthermore, in order to reduce the friction generated after the limit rod 410 contacts the inner ring, a semi-cylindrical abutment portion 411 is provided at one end of the limit rod 410 facing the inner ring, wherein the bent portion of the abutment portion 411 contacts the inner ring, thereby reducing the contact area between the limit rod 410 and the inner ring.

[0038] A limit support 420 is provided on each spacer plate 300, and two limit supports 420 are provided on each spacer plate 300. The limit support 420 has the same function as the limit rod 410, and is used to prevent the retaining frame from contacting the outer ring of the bearing over a large area. In addition, the limit support 420 has a curved surface on the side facing the pocket, and the curved structure of the curved surface corresponds to the rolling body. The limit support 420 can also support the rolling body. Since the volume of the wind power bearing is large, the assembly is more complicated. After the limit support 420 is provided, the rolling body will not slip after being assembled to the retaining frame, which can improve the assembly efficiency of the wind power bearing.

[0039] Since the entire vertical support unit is formed by enclosing a plurality of unit retainers, in order to facilitate the splicing between the unit retainers, the limiting supports 420 on the spacer plates 300 at both ends of each unit retainer are all one-way supports facing the inside of the retainer, and the limiting supports 420 on other spacer plates 300 are all two-way supports to support the rolling elements in two adjacent pockets. There is no contact between the limiting supports 420 on two adjacent spacer plates 300, forming a certain gap, which can not only improve the heat dissipation effect, but also facilitate the lubricating oil to enter the pocket to lubricate the rolling elements. In addition, after the limiting supports 420 are set, the limiting supports 420 can optimize the overall structure of the retainer, make it more evenly stressed, improve its structural strength, and reduce the possibility of deformation of the retainer under heavy load.

[0040] Since the cage is not designed with other structures to wrap the rolling element, in order to improve the limiting effect on the rolling element, the window beam is selected as a plate-shaped spacer 300 to improve the limiting effect on the rolling element. In addition, along the direction from the first end plate 100 to the second end plate 200, the spacer 300 gradually expands, and the limiting effect on the rolling element is further improved through the gradual change of the structure of the spacer 300.

[0041] The present invention also proposes a bearing, which includes a retaining frame, an inner ring, an outer ring and rolling elements as described above. Specifically, the specific structure of the retaining frame refers to the above embodiment. Since the bearing adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here one by one.

[0042] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A cast wind turbine retainer, characterized in that: The unit is formed by at least two unit holders, and the unit holder includes: a first end plate; A second end plate, wherein both the first end plate and the second end plate are annular plate structures and are concentrically arranged; A spacer plate, one end of which is connected to the first end plate, and the other end of which is connected to the second end plate, and a pocket is formed between two adjacent spacers; a limiting unit, wherein the limiting unit is connected to the spacer plate, a portion of the limiting unit extends a predetermined distance toward the center of the first end plate, and another portion of the limiting unit extends a predetermined distance away from the center of the first end plate; The first end plate, the second end plate, the spacer plate and the limiting unit are integrally formed by high-pressure casting.

2. The cast wind turbine retainer according to claim 1, characterized in that: The first end plate, the second end plate, the partition plate and the limiting unit are all made of iron.

3. The cast wind turbine retainer according to claim 1, characterized in that: The first end plate, the second end plate, the spacer plate and the limiting unit are all made of copper.

4. The cast wind turbine retainer according to claim 1, characterized in that: The rolling body is a cylindrical rolling body, and the cylindrical rolling body protrudes from the limiting unit.

5. The cast wind turbine retainer according to claim 4, characterized in that: The limiting unit comprises: A limiting rod, the limiting rod extending toward the center of the circle by a predetermined distance; A limiting support, wherein the limiting support extends away from the center of the circle by a predetermined distance, and the limiting supports of two adjacent spacer plates support the rolling element.

6. The cast wind turbine retainer according to claim 5, characterized in that: One end of the limiting rod is provided with a semi-cylindrical abutment portion.

7. The cast wind turbine retainer according to claim 5, characterized in that: Part of the spacer plates are connected to the limit rods, and a plurality of the limit rods are evenly spaced and arranged. The spacer plates connected to the limit rods are defined as limit partitions, and two limit rods are connected to the limit partitions.

8. The cast wind turbine retainer according to claim 5, characterized in that: Each of the spacer plates is connected to the limit supports, each of the spacer plates is connected to two limit supports, the limit supports located at both ends of the first end plate are unidirectional supports, and the other limit supports are bidirectional supports.

9. The cast wind turbine retainer according to claim 1, characterized in that: The spacer plate gradually expands along a direction from the first end plate to the second end plate.

10. A bearing, characterized in that: include: Inner circle; Outer ring; And a cast wind turbine retaining frame as claimed in any one of claims 1 to 9.

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